LOANS HELD FOR INVESTMENT, Summary of Loans by Category (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) Category	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Summary of Loans by Category [Abstract]
Loans, gross	$ 2,453,631	$ 2,437,577
Allowance for loan losses	(39,649)	(42,098)	$ (45,019)	$ (45,553)
Loans held for investment, net	2,413,982	2,395,479
Commercial Real Estate [Member]
Summary of Loans by Category [Abstract]
Loans, gross	771,490	755,444
Allowance for loan losses	$ (14,621)	(17,245)	(19,020)	(18,962)
Commercial [Member]
Summary of Loans by Category [Abstract]
Number of sub-categories of loans | Category	2
Commercial [Member] | Specialized [Member]
Summary of Loans by Category [Abstract]
Loans, gross	$ 350,143	378,725
Allowance for loan losses	(3,275)	(4,363)	(5,458)	(5,760)
Commercial [Member] | General [Member]
Summary of Loans by Category [Abstract]
Loans, gross	475,593	460,024
Allowance for loan losses	(9,940)	(8,466)	(8,979)	(9,227)
Consumer [Member] | 1-4 Family Residential [Member]
Summary of Loans by Category [Abstract]
Loans, gross	378,361	387,690
Allowance for loan losses	(4,931)	(5,268)	(4,890)	(4,646)
Consumer [Member] | Auto Loans [Member]
Summary of Loans by Category [Abstract]
Loans, gross	255,703	240,719
Allowance for loan losses	(3,681)	(3,653)	(3,891)	(4,226)
Consumer [Member] | Other Consumer [Member]
Summary of Loans by Category [Abstract]
Loans, gross	73,245	68,113
Allowance for loan losses	(1,384)	(1,357)	(1,480)	(1,671)
Construction [Member]
Summary of Loans by Category [Abstract]
Loans, gross	149,096	146,862
Allowance for loan losses	$ (1,817)	$ (1,746)	$ (1,301)	$ (1,061)